Calculate radius, diameter, circumference, or area of a circle – enter any one value.
Circle Diagram
Enter Value
About Circles
A circle is defined by its radius. From it, you can calculate the diameter (2R), circumference (2πR), and area (πR²).
Real-world Examples
- Pizza: The size of a pizza is usually measured by its diameter
- Wheels: The circumference determines how far a wheel travels in one rotation
- Clocks: Clock faces are circular, with the radius determining the size
Frequently Asked Questions
What units can I use?
You can use any consistent units (mm, cm, m, km, in, ft, yd, mi). The calculator will maintain the same units for all results.
What is the difference between circumference and diameter?
The diameter is the distance across the circle through its center, while the circumference is the distance around the circle.
Disclaimer
The results provided by this calculator are for informational purposes only. While we strive for accuracy, we make no guarantees regarding the precision of the calculations. Use at your own risk.
Explore Our Wide Range of Calculators
At Calculator Premium, we offer a comprehensive collection of online calculators to simplify your calculations across various domains. Our tools are designed with precision and user-friendliness in mind.
Math Calculators
Solve complex mathematical problems with our range of math calculators including algebra, geometry, trigonometry, and statistics tools.
Engineering Calculators
Access specialized engineering calculators for mechanical, civil, electrical, and chemical engineering calculations.
Health Calculators
Monitor your health with our BMI, calorie, pregnancy, and other health-related calculators for better wellness management.
Finance Calculators
Make informed financial decisions using our loan, mortgage, investment, and retirement planning calculators.
Time Calculators
Manage your time efficiently with our date, time zone, age, and duration calculators for precise time-related computations.
Science Calculators
Explore scientific concepts with our physics, chemistry, and biology calculators designed for students and professionals.
Share Results